filter on data frame

Is this what you want?
tt <- matrix(1:20, ncol = 4)
tt
[,1] [,2] [,3] [,4]
[1,]    1    6   11   16
[2,]    2    7   12   17
[3,]    3    8   13   18
[4,]    4    9   14   19
[5,]    5   10   15   20
tt[tt[,1] < 3, ]
[,1] [,2] [,3] [,4]
[1,]    1    6   11   16
[2,]    2    7   12   17
To: r-help at stat.math.ethz.ch
From: AlessandroSemeria at cramont.it
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Subject: [R] filter on data frame
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X-Original-Date: Wed, 11 Dec 2002 19:28:28 +0100
Date: Wed, 11 Dec 2002 19:28:28 +0100

Hello R-list.
Someone know how to delete  rows on a char/num matrix
following some criteria without a loop (something like: my.matrix[my.matrix
[,4]<1e-5],
but this one put within rows, that follow citeria, "NA")?
Thanks!

A.S.

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